After finishing using blender, I tried to render it but the render icon won't show up at the top left of my laptop screen. How do I fix it?
So what seems to have happened here is you switched out the main menu bar for another 3d view. If you look at the extreme top left of your screen, to the left of what you have in the screenshot there should be a little icon with two small arrows. Click on that and a menu will pop up showing all of the different editors in blender. To get the menu you had before  you will want to select the info editor (the one with the blue i icon third from the bottom). That should get you back to where you were before.